Is the PDF compressor free?

Yes, completely free. No signup, no credits, no hidden fees. Compress unlimited PDF files for free.

Are my PDF files uploaded to a server?

No. All compression is done locally in your browser using pdf-lib. Your files never leave your device and are never uploaded to any server.

How much can I reduce my PDF size?

Compression results vary depending on the PDF content. PDFs with many embedded images can be reduced by 20-60%. PDFs that are mostly text may see smaller reductions, as text is already very compact.

Will compression reduce the quality of my PDF?

Using Low compression, quality loss is minimal and nearly invisible. Medium compression provides a good balance. High compression gives the smallest file but may reduce image quality visibly. Text and vector graphics are always preserved.

What is the maximum file size?

There is no hard file size limit. Since processing happens in your browser, very large PDFs may take longer depending on your device memory.

What does removing metadata do?

PDF metadata includes information like author name, creation date, software used, and document history. Removing it reduces file size slightly and can also improve privacy by removing personal information embedded in the file.

Why is my compressed PDF larger than the original?

This can happen if your PDF is already highly optimized, or contains mostly text and vector graphics with no embedded images. In this case, compression has little effect and may add a small overhead from the re-saving process.

Does this work on mobile?

Yes. iPixLab Compress PDF works on all devices including iPhone, Android, Windows, Mac, and Linux — directly in your browser.

Compress PDF Free Online — Reduce PDF File Size

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Drop your PDF here

or browse to upload · PDF only

📊 Size Comparison

📄 — 📑 — pages

Original

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→

Compressed

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Size reduced by 0%

ℹ️ This PDF is already well optimized. Little or no size reduction is possible with browser-based compression. Try a higher compression level or use the High option.

⚙️ Compression Level

🟢

Low

Best quality, moderate size reduction

Best Quality

🔵

Medium

Balanced quality and size reduction

Recommended

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High

Smallest file, some quality loss

Smallest

🔧 Options

Remove metadata

Strips author, dates, software info

Remove duplicate objects

Deduplicates repeated PDF objects

Remove annotations

Strips comments and markup

Compressing...

Tips

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Email Attachments

Most email services limit attachments to 10–25 MB. Use Medium compression to reduce your PDF enough to send without visible quality loss.

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Remove Metadata

Enable "Remove metadata" to strip author names, creation dates, and software info. This also slightly reduces file size and improves privacy.

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Text-Only PDFs

PDFs with mostly text compress very little — text is already efficient. For big savings, compress PDFs that contain many images or scans.

Free Online PDF Compressor — No Signup Required

iPixLab.com's PDF compressor reduces your PDF file size directly in your browser using pdf-lib. No software to install, no account to create, and no files ever uploaded to a server. Your documents stay private on your device.

When Should You Compress a PDF?

Sending via email (size limits)
Uploading to web forms
Saving storage space
Sharing via messaging apps
Faster web loading
Cloud storage optimization

Which Compression Level Should I Use?

Use Low for documents where quality is critical — legal contracts, high-res brochures. Use Medium for general use — reports, presentations, and most office documents. Use High when file size is the only priority and visual quality matters less.

100% Private — Files Never Leave Your Device

Unlike most online PDF tools that upload your files to cloud servers, iPixLab processes everything locally in your browser. Your documents are never sent anywhere — no privacy risk, no data storage, and no retention. Works on any device.